CN1050591C - Fired microporous carbon-aluminium brick - Google Patents
Fired microporous carbon-aluminium brick Download PDFInfo
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- CN1050591C CN1050591C CN94115019A CN94115019A CN1050591C CN 1050591 C CN1050591 C CN 1050591C CN 94115019 A CN94115019 A CN 94115019A CN 94115019 A CN94115019 A CN 94115019A CN 1050591 C CN1050591 C CN 1050591C
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Abstract
The present invention relates to a fired microporous aluminum-carbon brick which belongs to the field of fireproofing materials for blast furnaces. Super bauxite calcined at high temperature is used as a main raw material, phenolic resin as a binding agent is added, a micropore generation technology is used, and after molded, the fired microporous aluminium-carbon brick is fired in a reducing atmosphere at high temperature. The brick has the advantages of good alkali resistance, thermal conductivity, molten iron corrosion resistance, slag corrosion resistance, oxidation resistance, high heat shock stability, very low air permeability, small average pore radius less than 1 mum, pore volume larger than 70%, high refractoriness under load, long service life and remarkable economic benefit, and the brick is suitable for the middle lower parts of large-sized blast furnace shafts, furnace waists, furnace boshes, furnace hearths and furnace bottoms.
Description
The present invention relates to a kind of fired microporous carbon-aluminium brick that is used for large blast furnace and preparation method thereof.
Before the present invention, the blast furnace lining of China adopts high alumina brick, clay brick and common brick fuel to build by laying bricks or stones always, and blast furnace work-ing life is short, and generation blast furnace needs repair in 2～3 times, with to compare gap external blast furnace campaign bigger.China developed Si in recent years
3N
4Bonded SiC brick, it is better to be used for shaft middle and lower part effect, is difficult to widespread use but cost an arm and a leg, so people begin to seek a kind of long-lived requirement of blast furnace of both having satisfied, and the cheaper again alumina carbon brick of price is as refractory materials.Once disclose the Japanese Patent spy in August, 88 and opened " the State of Blast Furnace bottom structure " of clear 63-57706 (4) by people such as Nippon Steel Corporation's creek well and man invention, in this patent application, proposed with refractory materials and masonry way at the bottom of the brick brickwork of little pore of bulk, but the generation technology of little pore brick is not provided, therefore can't solves the long-lived brick problem of using of China's blast furnace.Number be " alumina carbon brick and the making thereof " that 88101486.9 in disclose by Ministry of Metallurgical Industry Wuhan iron and steel designing institute application in Chinese patent application in October, 89, the described alumina carbon brick of the file of this patent application, be actually formed green brick and under 250～500 ℃ of low temperature, make phenolic resin curing, although maturing temperature is low, production process is simple, less energy consumption, but the technical indicator of brick is low, can not satisfy the large blast furnace service requirements far away, does not more reach the purpose that improves the large blast furnace life-span.
The purpose of this invention is to provide a kind of fired microporous carbon-aluminium brick and preparation method thereof, this brick has multinomial premium properties, can be used in liners such as building large blast furnace furnace bosh, shaft middle and lower part by laying bricks or stones, and can improve large blast furnace work-ing life.
The present invention in order to achieve the above object, designed a kind of fired microporous carbon-aluminium brick, with the high-temperature calcination high grade bauxite is main raw material, with resol is wedding agent, it is characterized in that the raw material composition is by weight percentage: contain high-temperature calcination high grade bauxite 40～65, fused corundom powder 20～30, crystalline flake graphite 7～13, crystallization Si micro mist 4～14, clay powder 1～3, add 4～6 resol.
Fired microporous carbon-aluminium brick of the present invention, the high-temperature calcination high grade bauxite that accounts for weight 40～65% with usage quantity in the raw material is a main raw material, and the fine raw material is the basis of production high-quality brick, and the high grade bauxite of selected high-temperature calcination requires to contain AL
2O
3〉=85%, Fe
2O
3＜1%, refractoriness 〉=1790 ℃, body close 〉=3.2g/cm
3, granularity 0～4mm, through the high grade bauxite density height of high-temperature calcination, make the process volume change of burned brick little, the density of product is also big, and guarantees the alkali resistance of high grade bauxite itself, makes finished bricks have good alkali resistant metal attack and low Gas permeability.
Fused corundom powder proportional quantity is 20～30% among the present invention, requires to contain AL
2O
3〉=95%, granularity is less than 300 orders, the fine powder material of corundum can filling between the alumina particles of aggregates, can clearly illustrate on the lithofacies structure photo corundum in pelletized form, column and tubbiness dense distribution be in the alumina particles of aggregates, make the structure particularly compact of brick, hole seldom plays an important role to aperture, raising alkali-resistivity, the anti-slag iron aggressiveness that reduces little pore.
The crystalline flake graphite proportional quantity is 7～13% among the present invention, require the crystalline flake graphite carbon content greater than 95%, ash content less than 5%, granularity is less than 100 orders, because graphite has good thermal conductivity and alkali resistant metal attack, graphite and corundum equally be with the fine powder filling between particles of aggregates, forming network-like graphite-structure in brick, is the prerequisite that obtains high thermal conductivity and good alkali-resistivity microporous carbon-aluminium brick.Carbon content has tangible influence to thermal conductivity, and the crystalline flake graphite proportional quantity is lower than 7%, and thermal conductivity does not reach requirement with regard to variation, and the adding of crystalline flake graphite simultaneously improves the temperature that loading softening begins greatly, makes it greater than 1650 ℃.
Crystallization Si micro mist proportional quantity is 4～14% among the present invention, and the si content that requires crystallization Si micro mist is greater than 95%, and granularity is less than 300 orders.Crystallization Si micro mist can generate β type SiC with C in high temperature burns till, redistribute in brick, filling reduces little air vent aperture among pore, be one of dominant mechanism that generates at little pore, allocate crystallization Si micro mist into and help to obtain the little little pore brick in Gas permeability harmonic(-)mean aperture.
Add 1～3% clay powder among the present invention, mainly play the enhancing compressive strength.
Add 4～6% resol among the present invention and make wedding agent, resol is coking at high temperature, generate a kind of isotropy vitroclastic, be a kind of ultimate attainment close carbonaceous thing, it is almost sealed the interior size particles of brick hole on every side also with the size particles in the even coated brick of filling mode entirely by this carbonaceous thing, the perforation pore is few, thereby the generation of favourable micropore reduces Gas permeability, and its bonding strength high energy satisfies the requirement of large blast furnace refractory brick simultaneously.
The making method of fired microporous carbon-aluminium brick of the present invention, weigh by above-mentioned each proportioning raw materials, mixed grind, compression molding, oven dry is burnt till, it is characterized in that the raw material composition is by weight percentage: contain high-temperature calcination high grade bauxite 40～65, fused corundom powder 20～30, crystalline flake graphite 7～13, crystallization Si micro mist 4～14, clay powder 1～3, add 4～6 resol, earlier high-temperature calcination high grade bauxite and wedding agent are warming up to 40～60 ℃ respectively after weighing, mixed grind 1～3 minute, add other raw material mixed grind again, ageing mixture after the mixed grind, the ageing mixture time should be greater than 8 hours, compression molding behind the ageing mixture, the adobe of oven dry is at high temperature burnt till in the reducing atmosphere, the temperature of burning till is 1530～1650 ℃, soaking time 40～50 hours.
The present invention the steps include: the quality and the fineness of (1) control raw material, accurately weighing and proportioning in process of production to the processing requirement strictness of each link; (2) earlier high-temperature calcination high grade bauxite and wedding agent are warming up to 40～60 ℃ respectively, mixed grind is 1～3 minute in edge runner-wet mill, adds other raw material mixed grind again, ageing mixture after the mixed grind, and the ageing mixture time should be greater than 8 hours; (3) the adobe density 〉=2.8g/cm after the compression molding
3, adobe any surface finish flawless; (4) oven dry adobe; (5) adobe is burnt till in reducing atmosphere, and the temperature of burning till is 1530～1650 ℃, soaking time 40～50 hours.
If raw materials quality is bad in process of production, proportioning is nonconforming in the present invention, weighing is inaccurate, all directly have influence on the quality of brick, the surface is not bright and clean when showing green brick forming the earliest, occurs laminar crack in a large number; If the micro mist amount is not enough, just do not generate the condition and the basis of little pore brick; The high grade bauxite and the wedding agent of high-temperature calcination are heated to 40～60 ℃ respectively, have certain temperature to help wedding agent to disperse to adhere on the alumina aggregate; Through 8 hours ageing mixtures, any surface finish in the time of can making the brick moulding avoided producing slabbing after whole raw material mixed grinds; Density 〉=the 2.8g/cm of brick after the moulding
3, can guarantee the density of brick; Adobe is dried in drying shed, about 100 ℃ of drying temperatures, about 50 hours of time; Alumina carbon brick of the present invention requires to burn till under the reducing atmosphere condition, the temperature of burning till is got 1530～1650 ℃, soaking time 40～50 hours, this depends on the temperature of reaction of crystallization Si micro mist and graphite on the one hand, firing temperature has tangible influence to alkali-resistivity, thermal shock resistance and Gas permeability simultaneously, if the temperature of burning till will make the Gas permeability of brick too high at 900～1000 ℃, and the alkali-resistivity that is lower than 1530 ℃ of bricks obviously descends, the temperature of burning till is higher than 1650 ℃ of burnups and increases, and takes all factors into consideration firing temperature and gets 1530～1650 ℃ and be advisable; Soaking time is relevant with the temperature of burning till, and burns then soaking time with 1650 ℃ and gets 40 hours, and 1530 ℃ of firing temperatures then soaking time were got 50 hours.
Fired microporous carbon-aluminium brick of the present invention and preparation method thereof further specifies with embodiment: embodiment 1: get the satisfactory raw material of quality ready, by weight percentage through accurately weighing, take by weighing high-temperature calcination high grade bauxite 55%, fused corundom powder 25%, crystalline flake graphite 9%, crystallization Si micro mist 9%, clay powder 2%, be equipped with 6% resol in addition, earlier high-temperature calcination high grade bauxite and wedding agent are warming up to 40 ℃ respectively, mixed grind is 2 minutes in edge runner-wet mill, added all the other raw material mixed grinds again 15 minutes, ageing mixture then, pug is with 300 tons of friction press impact briquettings after 8 hours, about punching press number of times 20 times, adobe density 〉=2.8g/cm
3, adobe any surface finish, smooth flawless are sent into adobe in the drying shed and are dried, 100 ℃ of drying temperatures, and dry 50 hours, the adobe of oven dry was sent into down-draft kiln and was burnt 50 hours under 1530 ℃ of temperature in reducing atmosphere.The brick of kiln discharge is a fired microporous carbon-aluminium brick of the present invention just, this brick reaches 61.38Mpa through the check compressive strength, apparent porosity reaches 17.25%, load softening point is greater than 1650 ℃, average pore radius 0.6952 μ m, pore radius less than the pore volume of 1 μ m greater than 78.43%, Gas permeability is 0.020mDa, thermal conductivity is 8.94W/mk during 0.443%, 900 ℃ of oxidation ratio, and molten iron corrosion index 2.81% resistance to slag corrosion, alkali-resistivity are good, thermal shock resistance is greater than 100 times.Embodiment 2: by the above-mentioned raw materials requirement, take by weighing high-temperature calcination high grade bauxite 64% earlier and be warming up to 60 ℃ respectively with 4% resol that other is equipped with, mixed grind is 3 minutes in edge runner-wet mill, added fused corundom powder 20%, crystalline flake graphite 10%, crystallization Si micro mist 5%, clay powder 1% mixed grind again 15 minutes, pug is with 400 tons of friction press impact briquettings after the ageing mixture 8 hours, about punching press number of times 15 times, adobe density 〉=2.8g/cm
3, adobe any surface finish, smooth flawless are sent into adobe in the drying shed and are dried, and 100 ℃ of drying temperatures dried by the fire 48 hours, and the adobe of oven dry is sent into down-draft kiln and was burnt 48 hours under 1570 ℃ of temperature in reducing atmosphere.The brick of kiln discharge is a fired microporous carbon-aluminium brick of the present invention just, this brick reaches 61.2MPa through the check compressive strength, apparent porosity reaches 16.1%, and load softening point is greater than 1650 ℃, average pore radius 0.895 μ m, pore radius less than the pore volume of 1 μ m greater than 70%, Gas permeability is 0～0.304mDa, and thermal conductivity is 16.7W/mk during 0.93%, 900 ℃ of oxidation ratio, molten iron corrosion index 0.32%, resistance to slag corrosion, alkali-resistivity are good, thermal shock resistance is greater than 100 times.This batch brick uses at the positions such as shaft middle and lower part, furnace bosh, cupola well and furnace bottom of Anshan iron and steel plant iron work blast furnace, and is respond well.Embodiment 3: by the above-mentioned raw materials requirement, take by weighing high-temperature calcination high grade bauxite 50% earlier and be warming up to 50 ℃ respectively with 5% resol that other is equipped with, mixed grind is 2 minutes in edge runner-wet mill, added fused corundom powder 28%, crystalline flake graphite 11%, crystallization Si micro mist 8%, clay powder 3% mixed grind again 15 minutes, pug is with 400 tons of friction press impact briquettings after the ageing mixture 8 hours, about punching press number of times 15 times, adobe density 〉=2.8g/cm
3, adobe any surface finish, smooth flawless are sent into adobe the drying shed oven dry again, and the adobe of oven dry is sent into down-draft kiln and was burnt 40 hours under 1650 ℃ of temperature in reducing atmosphere.The brick of kiln discharge reaches 70.9Mpa through the check compressive strength, and greater than 70%, Gas permeability is 0mDa to pore radius less than the pore volume of 1 μ m, oxidation ratio 0.18%, thermal conductivity is 19.9W/mk in the time of 900 ℃, molten iron corrosion index 0, and resistance to slag corrosion, alkali-resistivity are good, thermal shock resistance is greater than 100 times.It is 1386m that this batch brick has been used for Wuhan Iron and Steel Plant iron work heat size
3The position such as furnace bosh, shaft middle and lower part of No. 1 blast furnace, result of use is good, the bricking life-span reaches 2 years, and uses Si
3N
4Suitable in conjunction with the SiC brick.
Fired microporous carbon-aluminium brick of the present invention and preparation method thereof can clearly be seen that from the foregoing description fired microporous carbon-aluminium brick has higher compressive strength and thermal conductivity, and mean pore size is less than 1 μ m, Gas permeability and molten iron corrosion index is extremely low, oxidation ratio is low, alkali-resistivity is good.But the thermal conductivity of the foregoing description 1 is more on the low side.
Because brick of the present invention has excellent characteristic, can satisfy the requirement that large blast furnace uses.Wuhan Iron and Steel Plant constantly was applied to brick of the present invention furnace bosh, shaft middle and lower part, bosh, cupola well, the furnace bottom of blast furnace from 91 years, result of use is all fine, and obviously improved the work-ing life of blast furnace.Brick of the present invention with at the Si that uses with the position
3N
4The bricking life-span in conjunction with the SiC brick is close, however brick of the present invention and Si
3N
4Differ 2500～4000 yuan in conjunction with the price of SiC brick is per ton, so the present invention provides a kind of refractory brick of high-quality low-cost for large blast furnace, and walked out a new road work-ing life for large blast furnace improves.Use remarkable in economical benefits of the present invention.
Fired microporous carbon-aluminium brick of the present invention is applicable to positions such as large blast furnace furnace bosh, shaft middle and lower part, bosh, cupola well and furnace bottom, can keep reasonable furnace preferably, improves smooth operation of furnace, stable and high yields, remarkable in economical benefits.
Claims (3)
1. fired microporous carbon-aluminium brick, with the high-temperature calcination high grade bauxite is main raw material, with resol is wedding agent, it is characterized in that the raw material composition is by weight percentage: contain high-temperature calcination high grade bauxite 40～65, fused corundom powder 20～30, crystalline flake graphite 7～13, crystallization Si micro mist 4～14, clay powder 1～3, add 4～6 resol.
2. the making method of a fired microporous carbon-aluminium brick, each raw material is weighed by proportioning, mixed grind, compression molding, oven dry is burnt till, it is characterized in that the raw material composition is by weight percentage: contain high-temperature calcination high grade bauxite 40～65, fused corundom powder 20～30, crystalline flake graphite 7～13, crystallization Si micro mist 4～14, clay powder 1～3, add 4～6 resol, earlier high-temperature calcination high grade bauxite and wedding agent are warming up to 40～60 ℃ respectively after weighing, mixed grind 1～3 minute, add other raw material mixed grind again, ageing mixture after the mixed grind, the ageing mixture time should be greater than 8 hours, compression molding behind the ageing mixture, the adobe of oven dry is at high temperature burnt till in the reducing atmosphere.
3. the making method of fired microporous carbon-aluminium brick according to claim 2 is characterized in that the adobe of drying at high temperature burns till in the reducing atmosphere, and the temperature of burning till is 1530～1650 ℃, soaking time 40～50 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94115019A CN1050591C (en) | 1994-08-25 | 1994-08-25 | Fired microporous carbon-aluminium brick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94115019A CN1050591C (en) | 1994-08-25 | 1994-08-25 | Fired microporous carbon-aluminium brick |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1108634A CN1108634A (en) | 1995-09-20 |
| CN1050591C true CN1050591C (en) | 2000-03-22 |
Family
ID=5037323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94115019A Expired - Fee Related CN1050591C (en) | 1994-08-25 | 1994-08-25 | Fired microporous carbon-aluminium brick |
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|---|---|
| CN (1) | CN1050591C (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1086683C (en) * | 1999-10-10 | 2002-06-26 | 重庆钢铁(集团)有限责任公司 | Refractory material for molten iron tank of iron mixing furnace |
| CN1296318C (en) * | 2004-04-15 | 2007-01-24 | 兰州海龙新材料科技股份有限公司 | Soper microporous carbon brick for furnace lining and its producing method |
| CN1328219C (en) * | 2006-01-06 | 2007-07-25 | 巩义市第五耐火材料总厂 | Highly heat-conductive porous die stamping charcoal brick and its production method |
| CN100351210C (en) * | 2006-06-13 | 2007-11-28 | 曹大庆 | High carbon high strength fireproof board |
| CN101423409B (en) * | 2008-11-27 | 2012-10-31 | 武汉钢铁(集团)公司 | Alumina-carbon lining brick for desulphurization hot-metal bottle and technique for producing the same |
| CN101503302B (en) * | 2009-03-06 | 2012-03-21 | 武汉科技大学 | Carboneous fire-resistant material for furnace brick lining and preparation thereof |
| CN102167306A (en) * | 2010-11-26 | 2011-08-31 | 湖南晟通科技集团有限公司 | roasting inserts of carbon elements for aluminium |
| CN102167307A (en) * | 2010-11-26 | 2011-08-31 | 湖南晟通科技集团有限公司 | Additive of baking filler for carbon for aluminum |
| CN102924097B (en) * | 2012-11-01 | 2014-05-14 | 郑州安耐克实业有限公司 | Carbon titanium combining self-protection brick for blast furnace hearth and furnace bottom |
| CN106316423B (en) * | 2016-08-19 | 2019-01-04 | 武汉科技大学 | A kind of castable refractory and its application method for Thermal Equipment lining |
| CN106518114B (en) * | 2016-11-15 | 2019-03-19 | 淄博工陶耐火材料有限公司 | The manufacture craft of ultralow-porosity, low thermal expansion fireclay refractory |
| CN109231972B (en) * | 2018-09-21 | 2021-04-23 | 郑州新光色耐火材料有限公司 | Light electric melting corundum brick |
| CN110483023B (en) * | 2019-08-21 | 2022-05-24 | 北京金隅通达耐火技术有限公司 | Microporous corundum brick and preparation method thereof |
| CN111559917B (en) * | 2020-06-05 | 2021-09-21 | 中钢集团洛阳耐火材料研究院有限公司 | Silicon carbide refractory wear-resistant material with microporous structure |
| CN117362055A (en) * | 2023-11-08 | 2024-01-09 | 中钢集团洛阳耐火材料研究院有限公司 | Al (aluminum) alloy 2 O 3 Preparation method of-SiC-C microporous brick |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036194A (en) * | 1988-03-28 | 1989-10-11 | 冶金工业部武汉钢铁设计研究院 | Alumina carbon brick and making thereof |
-
1994
- 1994-08-25 CN CN94115019A patent/CN1050591C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036194A (en) * | 1988-03-28 | 1989-10-11 | 冶金工业部武汉钢铁设计研究院 | Alumina carbon brick and making thereof |
Non-Patent Citations (1)
| Title |
|---|
| 《硅酸盐词典》1984年第6月第1版 1984.6.1 中国建筑工业出版社，中国硅酸盐学会 * |
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|---|---|
| CN1108634A (en) | 1995-09-20 |
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